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PLEASE help can't answer my little sister's question

  1. Aug 5, 2011 #1
    PLEASE help can't answer my little sister's question!!!!!!!!!

    She ask me IF I can give a situations where you can observe the objects accelerating/decelerating free fall bodies and objects that traveled at trajectory path

    I AM SO ANGRY cause can't answer her question :(((((((

    PLEASE HELP ME~~~~~~
    -thanks
     
    Last edited by a moderator: Aug 5, 2011
  2. jcsd
  3. Aug 5, 2011 #2
    Re: PLEASE help can't answer my little sister's question!!!!!!!!!

    For the good of the community (and the poster), the OP is here translated into English:

     
  4. Aug 5, 2011 #3
    Re: PLEASE help can't answer my little sister's question!!!!!!!!!

    I good place to start studying free fall and trajectories is with tennis balls in a field. Have someone throw the ball with different initial forces, and different initial angles and observe the trajectories. The ball follows a parabolic trajectory because the acceleration due to gravity is constant.
     
  5. Aug 5, 2011 #4

    256bits

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    Gold Member

    Re: PLEASE help can't answer my little sister's question!!!!!!!!!

    The moon!!
     
  6. Aug 5, 2011 #5

    Drakkith

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    Science Advisor

    Re: PLEASE help can't answer my little sister's question!!!!!!!!!

    Roll a tennis ball off of a ramp into midair. Right when it hits the end, drop another one straight down from equal height. You can do this by hand or set up a neat little contraption to do everything exactly on time.
     
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